No. They will kill each other.
they are finichy only betta fish food is safe anything else will over fill poison or not provide enouph nutrients to keep the fisha alive
Betta fish need filtered and oxygenated tanks just like other freshwater fish. Pet stores that tell you that Betta fish don't need much room or filtered tanks are either ill-informed or just plain unethical. Too much current flow isn't healthy since Bettas like slow moving water. If you are putting a plant inside a tank with your Betta (and not keeping the Betta in a vase with a plant growing out of the top and the roots growing into the Betta's space), any freshwater fish-friendly plant is good. Just make sure that it is soft so it doesn't damage the Betta's delicate and beautiful fins. Don't put a Betta in a vase with or without a plant growing above it. Also, don't keep them in tight containers or small cups. This practice is cruel and inhumane!
No. Charcoal bits will harm your betta fish. But you can use deactivated charcoal bits
Some betta kits come with bamboo; it's completely fine
Yes
you can not simply keep two betta's safe in one aqaurium. for them two be safe you need to use separate aqariums that are distant from each other or use a betta aquarium divider that is not clear so they can't see each other.
Betta's are prone to jumping out of the bowl when it is filled right to the top. You betta probably jumped because it was trying to explore its surroundings, and didntr realize that outside of its bowl was not a safe area for a fish. Preventing bettas from jumping out is as simple as leaving 2-3" of the bowl unfilled in the future.
Yes, your betta water conditioner should be a standard water conditioner that can be used in any fish tank.
With anything new to it's environment, a betta fish will be cautious of anything new to it's tank (this is because of their territorial traits). But depending on the betta, it will take a day or so for it to get used to the props/scenery. But don't be surprised if the betta stays clear of a certain area, he/she may not know if it is safe or not.
A safe way to catch a betta fish to clean its bowl is with a small fish net. A fish net removes some of the fishes natural protective body slime but as long as it is healthy the coating will quickly grow back.
A fish will most likely die if you put a cleaning agent in its fish bowl without removing the fish. You should remove your fish with a net and place it in another safe container until fish bowl is clean.
Depending on the fish, it might be aggressive towards your tetras and mollies, which tend to be pretty passive fish. I wouldn't, just to be safe.